Systemic and enteric salmonellosis in calves

Abstract

This report describes the clinical manifestation of different Salmonella serovars in dairy calves. S. typhimurium was identified in faecal samples of a calf with rectal prolapse and in faecal samples and mesenteric lymph nodes of a calf with necrosis at the tip of the tail. S. agona was identified in faecal samples of a calf with diarrhoea but no other clinical manifestation, and S. dublin was observed in faecal and organ samples from a calf with neurological symptoms. Assays to differentiate between the main enteric pathogens (Enteropathogenic E. coli, rotavirus and coronavirus) were performed and were negative. Due to the negative impact of salmonellosis and occurrence of different serovars and clinical manifestations in calves, the correct diagnosis is important to identify control and prophylactic measures in a dairy herd. Key words: Salmonellosis, calves, diagnosis, serovars ResumoEste relato de caso descreve a manifestação clínica de diferentes sorovares de Salmonella em bezerros leiteiros. A S. typhimurium foi identificado em amostras fecais de um bezerro com prolapso rectal e em amostras fecais e linfonodos mesentéricos de um bezerro com necrose na ponta da cauda. Já a S. agona foi identificada em amostras de fezes de um bezerro com diarréia, mas sem nenhuma outra manifestação clínica, e a S. dublin foi observada em amostras de fezes e de órgãos a partir de um bezerro com sinais clínicos neurológicos. Diagnóstico diferencial para os principais patógenos entéricos (E. coli enteropatogênica, rotavirus e coronavirus) foram realizados e foram negativos. Devido ao impacto negativo da salmonelose e a ocorrência de diferentes sorotipos e manifestações clínicas em bezerros, o diagnóstico correto é importante para identificar formas de controle e medidas profiláticas no rebanho leiteiro.

Antimicrobial susceptibility and molecular characterization of Salmonella serovar Ndolo isolated from outbreaks in cattle and horses

“…Clinical manifestations of salmonellosis vary depending upon the serovar involved and the host's susceptibility (BARROW et al, 2010;JUFFO et al, 2016). The most common Salmonella serovars responsible for outbreaks in calves are Typhimurium and Dublin (COURA et al, 2015;MOHLER et al, 2009); whereas, Typhimurium, Anatum, Newport, and Agona are serovars commonly reportedin infect foals (CUMMINGS et al, 2016;OLIVO et al, 2016). Interestingly, some Salmonella serovars, such as Dublin in calves or Choleraesuis in pigs, are classified as host-adapted strains and infect a limited number of species (BARROW et al, 2010).…”

Antimicrobial susceptibility and phylotyping profile of pathogenic Escherichia coli and Salmonella enterica isolates from calves and pigs in Minas Gerais, Brazil

“…is also one of the major pathogens associated with enteric diseases in animal production (Brenner 2000). The different clinical manifestations of salmonellosis include diarrhea, abortion, pneumonia, septic arthritis, meningitis, gangrene of distal extremities, and others, which are associated with the virulence of the serotypes, infectious dose, and host immunity (Mohler et al 2009;Nielsen 2013;Coura et al 2015b). Salmonella spp.…”